From eb05efbfe58a7815957844e6dbe28735e85393cf Mon Sep 17 00:00:00 2001 From: Tim Gover <990920+timg236@users.noreply.github.com> Date: Wed, 15 Jan 2020 11:26:19 +0000 Subject: [PATCH] usb: xhci: Raspberry Pi FW loader for VIA VL805 The VL805 FW may either be loaded from an SPI EEPROM or alternatively loaded directly by the VideoCore firmware. A PCI reset will reset the VL805 XHCI controller on the Raspberry Pi4 requiring the firmware to be reloaded if an SPI EEPROM is not present. Use a VideoCore mailbox to trigger the loading of the VL805 firmware (if necessary) after a PCI reset. Signed-off-by: Tim Gover --- drivers/usb/host/pci-quirks.c | 31 +++++++++++++++++++++- include/soc/bcm2835/raspberrypi-firmware.h | 2 +- 2 files changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index 6c7f0a876b96..c3367b053044 100644 --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -18,7 +18,7 @@ #include #include "pci-quirks.h" #include "xhci-ext-caps.h" - +#include #define UHCI_USBLEGSUP 0xc0 /* legacy support */ #define UHCI_USBCMD 0 /* command register */ @@ -630,6 +630,32 @@ bool usb_amd_pt_check_port(struct device *device, int port) } EXPORT_SYMBOL_GPL(usb_amd_pt_check_port); +/* The VL805 firmware may either be loaded from an EEPROM or by the BIOS into + * memory. If run from memory it must be reloaded after a PCI fundmental reset. + * The Raspberry Pi firmware acts as the BIOS in this case. + */ +static void usb_vl805_init(struct pci_dev *pdev) +{ +#if IS_ENABLED(CONFIG_RASPBERRYPI_FIRMWARE) + struct rpi_firmware *fw; + struct { + u32 dev_addr; + } packet; + int ret; + + fw = rpi_firmware_get(NULL); + if (!fw) + return; + + packet.dev_addr = (pdev->bus->number << 20) | + (PCI_SLOT(pdev->devfn) << 15) | (PCI_FUNC(pdev->devfn) << 12); + + dev_dbg(&pdev->dev, "RPI_FIRMWARE_NOTIFY_XHCI_RESET %x", packet.dev_addr); + ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET, + &packet, sizeof(packet)); +#endif +} + /* * Make sure the controller is completely inactive, unable to * generate interrupts or do DMA. @@ -1207,6 +1233,9 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev) if (pdev->vendor == PCI_VENDOR_ID_INTEL) usb_enable_intel_xhci_ports(pdev); + if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) + usb_vl805_init(pdev); + op_reg_base = base + XHCI_HC_LENGTH(readl(base)); /* Wait for the host controller to be ready before writing any diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h index 7800e12ee042..cc9cdbc66403 100644 --- a/include/soc/bcm2835/raspberrypi-firmware.h +++ b/include/soc/bcm2835/raspberrypi-firmware.h @@ -90,7 +90,7 @@ enum rpi_firmware_property_tag { RPI_FIRMWARE_SET_PERIPH_REG = 0x00038045, RPI_FIRMWARE_GET_POE_HAT_VAL = 0x00030049, RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00030050, - + RPI_FIRMWARE_NOTIFY_XHCI_RESET = 0x00030058, /* Dispmanx TAGS */ RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE = 0x00040001, -- 2.24.1